Keeping the heat In???

You could use one of those rolls of electrically heated line like you put in gutters and in roof valley’s to keep ice from building up and make a double floor, and maybe even walls, and attach the line in a snaking pattern covering as much area as evenly as possible. Plug it into a timer that will turn it on when your lights go out and it heats the floor, and if you want or need also the sides of the box and the heat radiates in. You do not have to worry about airflow or light leaks but you get heat and you can make it an evenly spread around heat.


Additional:
　
What I meant by double wall and or floor is the outer one is what actually seals the box from light. The inner floor/walls, with the heat-line sandwiched between could be anything from solid plywood to plywood with holes drilled through it to allow more heat to radiate faster to a plastic grate of some sort or a heavy mesh wire that would fully support the pots/growing system/medium.

The line itself is made to get wet since it is used to melt ice and snow so if when watering it got wet it would not be a problem so it does not have to be sealed itself so whatever is easiest and that assures enough heat radiates in then that is the right material to use.

Yes thanks for the inspiration kayuman It is much appreciated and for anyone else with an idea usually just some rambling about a subject gets my mind flowing better than sitting here making it up in my head while I'm high.... In all honesty I thought someone might have been like... oh ya been there done that.... check out my cold weather outdoor grow box... it sits outside all winter long lol ....but I guess there's not to much of that going on lol .....

That's a fantastic idea Brick top thanks

An enclosed box should stay pretty warm when the light in ON, but will get cold very quickly once the light goes off. The water in the DWC system will get cold, too. Hmm... maybe put some of those heating mats under the plants? The kind you use for starting seedlings, etc. If you build the box large enough and with an extra waterproof compartment you could put a small space heater in there for when the lights go off. One of the tiny ones you'd use under your desk or workbench should be fine.

Bauks said:

That's a fantastic idea Brick top thanks

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Something I did not give much detail about but might be worth mentioning if you are considering trying what I mentioned is I said if you wanted or thought you needed more heat than could just be radiated from the floor you could go part way up the walls.
　
Of course you will want to use a quality reflective material on the inner walls of your box but it does not need to go all the way to the bottom of the walls. I do not recall if you said you will be growing in pots or what but whatever you are growing in takes up some height and only what is above that height needs reflective material. Any used below that level, if it did anything at all it would only be reflecting light against pots or something so it would be useless.

So if you needed or thought you needed more of the heat-line and wanted to run it up the walls a way you could do the same sort of thing in the lower part of the walls as in the floor, up to the height of whatever you grow in.

Following kayuman's idea, you could box in a small heater and use that to draw in your fresh, heated, air. I have a similar problem, although my garage is heated.. I don't like keeping it above 10C in the winter. Garage is attached so I can draw in air from the house

Most of the heating cables i looked at here turn on when the temp get to 38F wayyy to cold but I found one I think will work and for cheap too ^^ I'll have to do some more research to find out how warm some of these pads and cables get

http://www.mclendons.com/item.asp?sku=10154440

To sguardians2: Thank you very much for the +rep .... I wish my greenthumb(s) were as on par with my building skills, however in the end I hope that Bauks can manage up a sub zero grow room, might start a whole new trend for some frosty cannucks


Please let us know what you finally end up with Bauks,

Good Growing

Kayuman

What about a CO2 generator without air cooling? If you are going to have to pay to heat your plants, why not get some CO2 out of it?